Description

The objective of this technique is to provide a way for people who are deaf
or otherwise have trouble hearing the dialogue in audio visual material to be
able to view the material. With this technique all of the dialogue and
important sounds are available in a sign-language interpretation video that
is displayed in a caption area.

With SMIL 1.0, separate regions can be defined for the two videos. The two
video playbacks are synchronized, with the content video displayed in one
region of the screen, while the corresponding sign-language interpretation
video is displayed in another region.

The example shows a <par> segment
containing two <video> tags. The
system-captions attribute indicates that the sign language video
should be displayed when the user's player setting for captions
indicates the preference for captions to be displayed. The
<layout> section defines the regions
used for the main video and the sign language interpretation video.

Related Techniques

Tests

Procedure

Enable control in content or player to turn on sign language
interpretation (unless it is always shown)

Play file with sign-language interpretation

Check whether sign language interpretation is displayed

Expected Results

#3 is true

If this is a sufficient technique for a success criterion, failing this test procedure does not necessarily mean that the success criterion has not been satisfied in some other way, only that this technique has not been successfully implemented and can not be used to claim conformance.

Techniques are Informative

Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.0 is the success criteria from the WCAG 2.0 standard—not the techniques. For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.0.